IS 11169 (Part 1):1984 45C8 Steel: Specifications & Listings
IS 11169 (Part 1):1984 45C8: Cold heading quality carbon steel 45C8 to IS 11169 (Part 1):1984, for quenching and tempering, supplied as wire, wire rod or bars of 2 to 100 mm diameter. Old designation C45. The standard was reaffirmed in 2004.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Other composition limitsfrom the clauses and notes
Sulphur and phosphorus, maximum
0.035 percent each; other limits by agreement
Elements not specified, maximum
Cr 0.15, Ni 0.15, Cu 0.15, Sn 0.02, Mo 0.05, V 0.05 percent; total 0.40
Narrower carbon and silicon ranges may be agreed between purchaser and manufacturer; elements not listed are not added except by agreement or to finish the heat.
Source: IS 11169 (Part 1):1984, clauses 4.1.2, 4.1.3, 4.2 and 4.4, Table 2 notes
Hardness in the annealed condition1 condition
Annealed, maximum
170 HB
Brinell hardness for products delivered in the annealed condition.
Source: IS 11169 (Part 1):1984, Table 5, clause 8.1
Hardened and tempered, by ruling section3 sections
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Reduction of area (%)
Izod impact (J)
Limiting ruling section (mm)
700-850
460
14
25
20
16
660-810
410
16
40
20
40
620-770
375
17
45
20
100
Recommended values for guidance (clause 9.2.1), on test pieces taken from rounds in the direction of the fibre. Reduction of area at 16 mm is printed as 25.
Source: IS 11169 (Part 1):1984, Table 6
Core hardenabilityguidance
Core hardness after oil quenching
40 HRC
Up to diameter
12 mm
Hardening temperature
830 to 860 °C
Diameter up to which this core hardness can be reached after quenching in an oil of high quenching capacity. For guidance only.
Source: IS 11169 (Part 1):1984, Appendix C
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